我安装了 flutter search field 0.6.2 包，添加项目时出现错误

Question

我已经安装了一个包来向我的项目添加一个下拉字段，但我希望该字段看起来像 this video 中的那样。我收到以下错误。

//DropdownSearch
                      Container(
                        height: MediaQuery.of(context).size.height * 0.7,
                        child: Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            Padding(
                              padding: EdgeInsets.all(20.0),
                              child: Text(
                                'Select a country',
                                style: TextStyle(
                                    fontSize: 16, color: Colors.blueGrey),
                              ),
                            ),
                            Container(
                              child: SearchField(
                                suggestions: [
                                  'Afghanistan',
                                  'Turkey',
                                  'Germany',
                                  'France',
                                  'Italy',
                                  'Spain',
                                  'United Kingdom',
                                  'United States',
                                  'Canada',
                                  'Australia',
                                  'New Zealand',
                                  'India',
                                  'Indonesia',
                                  'Bangladesh',
                                  'Sri Lanka',
                                ],
                              ),
                            ),
                          ],
                        ),
                      ),

错误代码：

错误代码：

错误信息：

    The argument type 'List<String>' can't be assigned to the parameter type 'List<SearchFieldListItem<dynamic>>'.dartargument_type_not_assignable
Couldn't infer type parameter 'E'.

--

Tried to infer 'String' for 'E' which doesn't work:
  Return type declared as 'List<E>'
              used where  'List<SearchFieldListItem<_>>' is required.
The type 'String' was inferred from:
  Parameter 'element' declared as     'E'
                      but argument is 'String'.

Consider passing explicit type argument(s) to the generic.

Answer 1

该错误意味着您将字符串列表传递到接受动态类型（任何类型）的 SearchFieldListItem 对象的列表中。尝试将列表中的项目添加到具有给定对象的列表中。